In any case, if you have a dynamically assigned IP address on either a mobile or a broadband connection that has been used in the past for spamming this site, it is possible that it is blocked. You can try powering the device off for a while and then power it back on, hoping that you get a new unblocked IP address. Or if you are using a mobile, put it in Airplane mode for 10-15 minutes, then turn that mode off and try again.
I am not a lawyer or immigration advisor. My statements/comments do not constitute legal advice. E&OE. Please do not PM me for advice.